Burglar-alarm



(No Model.)

J. W. ROADS 82; T. J. GRIFFITH.

BURGLAR ALARM.

Patented June 4, 1889.

* UNITED STATES PATENT r OFFIcEQ JOSEPH \V. ROADS AND THOMASlJ. GRIFFITH, OF MARION, OI-IIO.

BuReLAa- LARM.

SPECIFICATION forming part of Letters fatent No. 404,734, dated June 4, 1889.

Application filed December 22, 1888. iSerial No. 294,364. (No model.)

To all whom it may concern:

Be it known that we, JOSEPH ROADS and THOMAS J. GRIFFITH, both residents of Marion, in the county of Marion and State of Ohio, have invented certain new and useful Improvements in Burglar-Alarms; and we do hereby declare that the following is a full, clear, and exact description of the invention, which will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, which form a part of this specification.

This invention relates-to burglar-alarms.

The object is to produce a burglar-alarm which will be automatic in its operation, certain in action and of the simplest construction.

WVith these objects in view the invention resides in a burglar-alarm consisting, essentially, of an alarm-bell having a series of wires connecting with it from the doors and windows in the building, and means for operatin g the same, whereby, should any of the doors or windows be tampered with after the device has been set, the bell-ringing mechanism will be released and an alarm sounded. Furthermore, the invention consists in the improved construction and combination of parts of a burglar-alarm, as will be hereinafter fully described in the specification, illustrated in the drawings, and pointed outin the claim.

In the accompanying drawings, forming part of this specification, and in which like letters indicate corresponding parts, we have illustrated one method of carrying our invention into effect, although the same may be done in Various other ways without departing from the spirit thereof, and in these drawings Figure 1 is a vertical sectional View of a house, showing our system applied thereto. Fig. 2 is a detail view of one of the triggers for starting the alarm to be secured over the door. Fig. 3 is a detail View of one form of trigger which may be used over the window. Fig. 4 is a similar View of another form; and Fig. 5 is a detail perspective view of the bell, showing a trigger for releasing the bell-ringing mechanism.

In carrying this invention into effect it is necessary to supply each window and door with a trigger, which will be operated when set by the window being raised or the door opened. To each of these triggers is secured a wire, which passes from the triggeralong over pulleys to a main wire, which connects with the trigger for releasing the bell-ringing mechanism. These triggers are so arranged that after having been operated they will automatically reset themselves.

The striking mechanism may be operated by a battery; but it is preferred that the bell should be operated by a mechanism similar to that employed in an alarm-clock, which,if desired, may be so constructed that after ringing a certain time it will stop itself, so that it may be used more than once. The object of having it constructed in this .ananner is that should the alarm be started accidentally, as by a person raising a window for any purpose, the alarm will not run entirely down, thereby rendering it inoperative for further action until rewound.

By referring to the accompanying drawings it will be readily understood how this system is carried into effect, and in these drawings A designates the wall of a house, B the partition separating the rooms, and O the floor. Over each of the windows 1 and the doors 2 is secured in a suitable bracket 3 a cam-shaped trigger 4, provided on one side with a recess 5. Within this recess moves an arm 6, provided with a longitudinal slot 7, which admits of its moving in and out in the recess. The lower end 8 of the arm is designed to rest upon the window-ledge 9, and is provided with a weight 10, which causes it -to resume its normal position after being pushed back. When this trigger is used for the door, the arm hangs low enough to strike the upper edge of the door when it is pushed open. To each of these cams is connected a wire 11, which passes from the window over a series of pulleys or through eyes to the alarm mechanism D. As shown in the drawings, the wires are exposed to View; but in carrying the invention into effect they will be placed between the walls, so as to be out of sight, and where an angle is to be turnedas, for example, in the corner of a roo1n-a bell-crank will be used. Each of these wires connects with a main wire 12, which leads directly to the trigger 13, for releasing the bell-ringing mechanism.

In order to accomplish this the shaft upon which the bell-hammer 14 is hung is provided with an upward-projecting arm 15, the upper end of the said arm being engaged by an opening formed in the trigger. Now, it will be seen readily that should a door or window be opened and the arm moved up or to one side, by reason of the cam-shaped trigger the wire will be drawn tight, and thus raise the trigger off from the arm of the ringing mechanism and thereby start it to ringin As soon as the window or door which has been opened is closed the arm on the cam will resume its normal position, and thus be ready to operate a second time.

During the day-time, when it is not necessary to use this ringing mechanism, the arm on the trigger is slid up in the recess in the eccentric and held there by means of a catch 10, which thus removes it out of contact with the window or door and thus prevents'its operating.

It will thus be seen that by the foregoing description,although this device is exceedin gly simple of construction, it will be found of highest efficiency in use, and may be placed in a house at but a slight expense.

Having thus fully described our invention, what we claim as new, and desire to secure by Letters Patent, is-

In a bnrglar-alarm, the combination of a bracket adapted to be secured over a window or door, a cam-shaped trigger pivoted in the bracket having a recess in one side, an adjustable arm moving in the said recess designed to rest against the window or door, ringing mechanism, a trigger for releasing the same, and a Wire connecting the camshaped trigger and the trigger of the ringing mechanism, whereby, when the said adjustable arm is moved, the ringing mechanism will be released, substantially as described.

In testimony that we claim the foregoing as our own we have hereunto aflixed our signatures in presence ,of two witnesses.

JOSEPH W. ROADS. THOMAS J. GRIFFI'II'I. Witnesses:

bro. CRAWFORD, J'. N. ALSTON. 

